RE: [sv-bc] Expected behavior of macro concatenation of macro

I tried the example on 3 different simulators.

One gave the answer you expected.

Another crashed.

The third considered the code illegal.

Wilson, we'll be establishing a sub-group to clarify macro semantics. Would you like to join?

Regards,
Shalom Bresticker

> -----Original Message-----
> From: owner-sv-bc@eda.org [mailto:owner-sv-bc@eda.org] On
> Behalf Of Wilson Snyder
> Sent: Tuesday, June 22, 2010 9:24 PM
> To: sv-bc@eda.org
> Subject: [sv-bc] Expected behavior of macro concatenation of macro
>
>
> What is the expected result of this code, which uses `` to
> build a macro name? I'd like the answer to be "repeats: 1 1
> 1" to match the C preprocessor, but this doesn't seem to be
> well supported. Either way, a spec example stating the
> behavior using `` to concatenate a define name would be
> appreciated.
>
> `define REPEAT_0(d)
> `define REPEAT_1(d) d
> `define REPEAT_2(d) `REPEAT_1(d)d
> `define REPEAT_3(d) `REPEAT_2(d)d
> `define REPEAT_4(d) `REPEAT_3(d)d
> `define REPEAT_5(d) `REPEAT_4(d)d
> `define REPEAT_6(d) `REPEAT_5(d)d
> `define REPEAT_7(d) `REPEAT_6(d)d
> `define REPEAT_8(d) `REPEAT_7(d)d
> `define REPEAT_9(d) `REPEAT_8(d)d
>
> `define CONCAT(a, b) a``b
> `define REPEAT(n, d) `CONCAT(`REPEAT_, n)(d)
>
> module t;
> initial begin
> $write("repeats: ");
> `REPEAT(3, $write("1 ");)
> $write("\n");
> end
> endmodule
>
> --
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